| Acastoides 
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| Acastoides zguilmensis, Devonian, Morocco | 
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| Scientific classification | 
| Domain: | Eukaryota | 
 
| Kingdom: | Animalia | 
 
| Phylum: | Arthropoda | 
 
| Class: | †Trilobita | 
 
| Order: | †Phacopida | 
 
| Family: | †Acastidae | 
 
| Genus: | †Acastoides Delo, 1935
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| Species | 
| A. henni (R. Richter, 1916) (type) = Acaste henniA. constricta (Salter, 1864) synonyms Phacops (Acaste) downingiae constrictus, P. constrictus, Acaste (Acastoides) constrictusA. acutilobata (Knod, 1908)A. gamonedensisA. haddadi Chatterton, Fortey, Brett, Gibb & McKellar, 2006A. insolitus Wolfart, 1968A. maura Alberti, 1969A. paeckelmanni R. Richter & E. Richter, 1939A. poschmanni Basse & Müller, 2016A. zguilmensis Chatterton, Fortey, Brett, Gibb & McKellar, 2006
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Acastoides is an extinct genus of trilobite that lived during the Silurian and Devonian. It has been found in Bolivia, France, Morocco, Poland, Turkey and the United Kingdom.